Quote:Originally posted by nights :shame:
ofcourse you cant MR bumpmap a maya texture, you would have to convert the map to a file, either using the convertion tool in the hyper shade or do it manually, either way is ok. good luck.

why ? my bump maps (maya 2d or 3d textures) are all working fine when rendered with mental ray

I've run into this problem a few times myself. i was actually searching for a similar thread i posted here awhile back so that i could post my solution. your mileage may vary but if you run into this problem the following explanation may help:

what i've notice when i can't get a bump map to render correctly in mental ray is that somehow mental ray has gotten confused as to which engine is controling the objects tessilation(maya or MI). this happens to me when i use a maya polySmoothSurface node. but i bet it could happen on nurbs or subdivs too. for some reason this doesn't effect color maps etc.

this is what worked for me --- i selected my geometry went to Window>Render editors>mentalray>approximation editor> - under subdivision approx i had to select "derive from maya" then i clicked assign.

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